Molds & Tooling
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PCABS Weld Line Strength
Problem Phenomenon
[Problem Phenomenon] PC/ABS multi-gate products have obvious weld lines and crack along the lines under stress
Cause Analysis
The temperature of the confluence front drops and molecular entanglement is insufficient; the high viscosity of the PC phase makes fusion more difficult; weld line strength can be 20-40% lower than the body; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Increase melt temperature and mold temperature to promote fusion; move weld lines out of the stressed area; set overflow wells to improve confluence quality; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PC/ABS weld line strength is discounted to 60%, with temperature and relocation as dual countermeasures; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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